(navigation image)
Home American Libraries | Canadian Libraries | Universal Library | Community Texts | Project Gutenberg | Children's Library | Biodiversity Heritage Library | Additional Collections
Search: Advanced Search
Anonymous User (login or join us)
Upload
See other formats

Full text of "The manufacture and properties of iron and steel"

INFLUENCE OF CERTAIN ELEMENTS ON STEEL.
'371
The lines in Fig. XVII-A are not plotted from Table XVII-ST, but the data have been combined to allow for the unequal number of heats in the groups. Thus by combining 1, 2 and 3 we get the first point of AAj from groups 2, 3 and 4 the second point; and so on. The result of this combination gives Table XVII-0, and the lines AA, BB take no account of variations in phosphorus or manganese. In the investigation by the method of least squares described in the preceding section it was found that 0.01 per cent, of phosphorus raised the strength of acid steel 890 pounds/and basic steel 1050 pounds per sq. in. In the present investigation the value of carbon is first determined/and then that of manganese and phosphorus,, but in order to find the value of carbon 'accurately it is essential to know the influence of both manganese and phosphorus. This makes necessary the method of successive approximations, but in the present case the methods used avoid to some extent the dependence of one determination upon another. Thus in1 the line A A, carbon is the one great variable; the proportions of phosphorus and manganese are not constant, but the groups of high-carbon steel contain* about the same amount of manganese and phosphorus as
TABLE XVII-N.
Groups Used to Find the Effect of Carbon, Phosphorus and     '                                     Manganese.
					Ultimate 
Class.	Number of heats.	Carbon ; per cent.	Phosphorus ; per cent.	Manganese ; per cent.	strength ; Ibs. per square inch.
	50	.1118	.0545	.408	. i 58,012
	131	.1463	.0567	.437	61,039
	58	'.1995	.0579	.475	66,809
	23	.3463	.0563	.484	70,736 ,
Line AA. Acid steel.	50 120 103	.3065 .3501 .4000	.0476 .0466 .0400	.528 .537 .518	'79,058 83,093 87,156: .';
	86	.4491	.0376	.520	92,824
	43	.4961	.0363	, .519	98,224
	8	.5460	.0354	.495	102,346
	6	.5863	.0330	.493	107,398
	135	.0451	.0082	'    .243	46,703       '
	125	.0974	.0084	.422	50,013
	134	.1531	.0116	.436	56,650      :
Line BB . Basic steel.	246 263 125	.12044 .2484 .2935	.0113 .0110 .0106	.472 .474 .464	61,236 64,744 68,307
	27	.3413	.0113	.461	72,065
	11	.3932	.0120	.499	78,625     ':
	1	.4310	.0070	.390	83,305